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en viroso <br /> Third Quarter Sampling <br /> Monitoring Wells MW-I through MW-3 were sampled and analyzed for Total Purgeable <br /> Petroleum Hydrocarbons (TPPH) according to EPA Method 8015 (Modified), benzene, <br /> toluene, ethylbenzene and xylenes (BTEX) according to EPA Method 8020, and methyl- <br /> tertiary-butyl ether (MTBE) according to EPA Method 8020 Well MW-3 was also <br /> analyzed for MTBE by EPA Method 8260 Additionally, a duplicate sample and an <br /> equipment blank were prepared and analyzed for quality control purposes <br /> Field monitoring data and this quarter's chemical analytical data for TPPH, BTEX, and <br /> MTBE are summarized in Table 1 Blaine's quarterly ground water monitoring report is <br /> presented in Appendix A <br /> Evaluation of Site Monitoring Capabilities <br /> An August 15, 1996 letter from SJCPHS requested that soil vapor extraction well VE-2 <br /> (VEW-2) be sampled this quarter, and that an evaluation of the monitoring capabilities of <br /> the site be provided in this report <br /> During the third quarter sampling event, Blaine attempted to sample both VEW-1 and <br /> VEW-2 Well VEW-1 was reported by Blaine to have a depth to water of 18 92 feet, and a <br /> total depth of 19 22 feet Well VEW-2 was reported to be dry, with a total depth of 40 61 <br /> feet The table presented below shows well screen details for all site wells <br />•' Total Current GW Screen Screen Interval (ft) <br /> Well Date Depth Depth (ft) Diam Top Bottom j <br /> Name Installed (ft) (In) <br /> MW-1 Jul-90 65 4410 4 45 65 <br /> MW-2 Jul-90 65 4370 4 45 65 <br /> MW-3 Jul-90 65 4500 4 45 65 <br /> VEW-1 Jun-90 20 1892 4 5 20 <br /> VEW-2 Jun-90 45 --- 4 20 45 <br /> Since depth to water measured in Wells MW-1 through MW-3 ranged from 43 70 to 45 00 <br /> feet, it appears that the sample collected from VEW-I was not representative of ground <br /> water conditions, but was instead water which had collected in the bottom of the well <br /> casing Well VEW-2 was dry <br /> m1__ 1_-__ I1.. L.., rl *-- I„ F-- J IZ t.- << F-pt 1-.01.x.,, �o T i,lo <br /> IIle tiller 111VI11tort ig WGI1J IIaVc scIr Ic-JI%CA1 I11LL•1 V a I a IIVI11 TJ LV V✓ LL. L UL Il VV grain I au— <br /> I shows that screens in Wells MW-1 and MW-2 have been submerged over the last three <br /> sampling events by water columns ranging in height from 0 69 to 2 45 feet Well MW-3's <br /> screens have been submerged on only one occasion, by 1 15 feet <br /> Considering the minimal depths by which these screens have been submerged we do not <br /> think that monitoring capabilities of this site have been compromised, or that replacement of <br /> 96374 2 <br />